- French physicist and chemist: Nobel Prize in physics 1926.
- Jean Baptiste (ʒɑ̃ batist). 1870–1942, French physicist. His researches on the distribution and diffusion of particles in colloids (1911) gave evidence for the physical reality of molecules, confirmed the explanation of Brownian movement in terms of kinetic theory, and determined the magnitude of the Avogadro constant. He also studied cathode rays: Nobel prize for physics 1926
